FireFox: GUI problem? Very interesting

Has anyone else besides myself (and canadian guy) noticed that Mozilla’s Firefox, sometimes adds a little space below your layout if you have a table cell or iFrame stretch it’s height to 100%? K let me give you two prime examples.

http://hollywoodburning.net (my client)
http://www.staplemusic.com/flash/staple_flashsite.html

Please notice the differences between viewing them in firefox, and viewing them in IE or netscape. In the hollywood burning one, it causes you to scroll (I’m not talking about the iframe) because of the dumb white space. In IE and netscape, I don’t believe it will. At all.

I’m looking for a solution to control this! It’s so freaking annoying!
If you figure it out, I’ll be your bestest friend.